EDIT: The donation page fooled me. After putting in a credit card, there is a step called 'personal.' It is not. It is the billing address for the card. I put in personal info and was rejected. I put in billing address and it went through. (Company card)
The rule for us little guys applies to big guys too: Re-inventing UI makes it harder for your customer, at least initially. Please don't do it unless there is a very good reason.
Stop copying Chrome! Because of your actions i am using now Vivaldi! But... If you ever decide to support power users again with something which does NOT require add-on installation and includes more advanced UI customization, i MAY be perhaps reconsidering my decision.
But not one single minute earlier!
Btw. I even know some professionals who are running PC shops who have abandoned Firefox and are refusing to install it on client's computers! Because of Australis, because of Pocket, Chat, Social Media, DRM, handling of the Brendan Eich case!
Please.... bring at least back the option to combine address bar and tabs! or an optional add-on bar.
But most important, stop copying Chrome and stop only serving the simple users. Because in the end it has been the advertising and support of Power users which did push you to the heights during Firefox versions 20-24! This group earns to get back a certain respect from you, and right now you are constantly asskicking that user group for no real sense making reason!
Time to abandon your recent minimalist and design centered way of thinking and time to go back to your roots... to a more customizable and unique experience which you served the user base in the past.
Mozilla right now is on a very terrible road. If you do not want it to become even more terrible, you really have to go back a big part of the way!
We are making changes. I hope that the community will see the changes soon. Now, as usual, not everybody will be happy. Part of it is that we're a relatively small team trying to fight giants. Part of it is that yes, we will keep experimenting, and that means making mistakes. And part of it is because Firefox lives in the world of https://xkcd.com/1172/, which exacerbates the previous two points.
But still, I hope that most people will appreciate the stuff we're working on – and I'm not just talking of code.
Caveat: Again, I'm speaking only for myself.